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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        var arr = [];
        for (var i = 0; i < 2; i++) {
            arr[i] = function() {
                console.log(i); //2个2
            }
        }
        arr[0]();
        arr[1]();


        var a = [];
        for (var i = 0; i < 10; i++) {
            a[i] = function() {
                console.log(i); // 10
            };
        }
        a[6]();


        let b = [];
        for (let i = 0; i < 2; i++) {
            b[i] = function() {
                console.log(i); //  0   1
            };
        }
        b[0]();
        b[1]();
    </script>
</body>

</html>